Fritz salomon



UNITED STATES PATENT OFFICE.

FRl'lZ'SALOMON, or ESSEN-ON-THE-RUHR, GERMANY, AssiGNoR 'lO FRIED. KRUPP, orv SAME PLACE.

PROCESS oF OBTAINING OXYGEN-Q:

srrzcrrrcarroxrormin part of Letters fPatent No. 440,777. date November 19,1890.

Application filed August 21, 1890, Serial No. 362,656. on specimens.) I

To all whont it may concern:

Be it known that I, FRITZ SALOMON, a subject of the Duke'of Brunswick, residing at -Essen-on-the-Ruhr, Prussia, Germany, have invented new and-.useful-Improvements in Obtaining Oxygen Gas from Atmospheric'Air,

.of which the following is aspecification.

The process hitherto generally adopted for obtaining oxygen :from atmospheric air is based upon the well-known property which 'spongy'barium oxide possesses of absorbing oxygen at a red heat and of giving it off at a scale for industrial purposes.

higher temperature, especially in a partial vacuum. This process, which has been very successfully carried out of late years by the.

Brothers 'Brin, is nevertheless subject to various defects which have prevented its general adoption and its being carried out on a large The difiiculty of producing spongy barium oxide, its relatively high price, the ease with tion.

The' process which forms the subject-matter of the present application is free from the above-mentioned defects and depends on the following chemical reactions:

\Vhen a mixture of lead monoxide (PhD) and of an alkaline earth is 'at a red heat brought into contact with a current of atmospheric-air, oxygen is absorbed and lead dioxide (PbO,) respectively, plumbate (R PbO,) are formed. This chemical reaction is well known and has been clearly demonstrated by the researches of Dr. Kassner. If the lead compound be now brought into contact with carbonic-acid gas, the previously-absorbed atmospheric oxygen isdriven 0E and a mixture of earthy alkaline carbonate and of lead monoxide is formed. the lead-oxide mixture absorbs"'atmospheric oxygen and at which carbonic acid drives the oxygen oft are not far apart.

My process consists in heating a mixture of lead monoxide and alkaline earth-for instance, lime-';o a good heat in a retort, so as The temperature at which to absorb oxygen from the atmospheric air.

In place of lead monoxide other compounds of lead maybe usedsnch as carbonate-; which are transformed into monoxide by heat. The proportions'of the constituent parts'of. 5.5 the mixture may beyaried; habit is desirable that for one equivalent of lead monoxide I from one to two equivalents of lime should be present. The mixture is heated to a red heat, or to about 800 to 1000 centigr'ade. A 66 current of atmospheric air is then-passed over it, the oxygen of which is absorbed while the nitrogen escapes. When carbonate is used in place of monoxide, nitrogen and carbonic acid escape together. The absorption of the oxygen at the proper heat is soon completed, being elfected through ,the admixture of lime the saturation; of the mixture with oxygen, when the temperature has fallen-to a certain point, the current of air, is turned 01! and carbonic-acid gas is passed over the glowing-compound, wherebythe oxygen is expelled while the carbonic acid combines with the remainingcalcium oxide; The reaction is as follows: Ca PbO 200 201x00 +Pb0 0. The oxygen driven off bythis reaction is collected or carried off for immediate use. The reaction is so rapid that at first only pure oxygen is givenoff, so that it can be collected without 'difliculty; At the close of the operation some carbonic acidpasses 0E, and this is easily removed by an absorbent, such as lime or sodium carbonate. The mixture of calcium carbonate and lead monoxide remaining in the retort after the expulsion of the oxy-' gen isimmediately treated with air while at a red heat, or to hasten the expulsion of the carbonic acid with a mixture of air and steam.. The same reaction-namely, the absorption 90 of oxygen by the mixtu reis eifected and the process may be repeated at pleasure. The regeneration of the mixture of the carbonate of an alkaline earth and of lead monoxide remaining in the retort after the expulsion of'95 are applicable for obtaining oxygen by the too above described process-4minslancc, the lower'oxides of manganese, whic at a red heat form with oxygen the highcr oxide of the metal combined with an alkaline earth, and which combinations are likewise decomposedby carboniciacid; but the'expulsion of oxygen is not as readily effected as with the lead compounds. Itis to be further remarked that both the oxygen of the pure dioxide -for example, PbO (or-'Mn0 )'a.nd' of the corresponding metallic peroxideefor-example, red lead ;(PbO PbO )is 'readily driven off by carbonic acid. v

What I clairn as my invention, and desire to secure by Letters Patent, is-

The herein-described process of obtaining oxygen from atmospheric air, which consists in heating a mixture of a metallic oxide,such

as; leadmonoxide or lead carbonate, and voi. an alkaline earth, suclf as lime, in a current '20 of air, so as to cause oxygen to be absorbed,

and then driving off thepxygcn bye. current of carbonic-acid gassubstautiallyas specified.

In testimony whereof I-havc signed/my, name to this specification in the presence of 2f;

twosubscribing witnesses.

Witnesses:

Fm'rz MOELLENHOFF, EMIL Boson.

. rrz A OMON. I

in batters Patent- No. 440,77

Correction Itis hereby certifiefl that the imxh 01' the assigue in pgttgrs Patent 1510 .";4AM),777 :1;- .grauted November 18,1890, upon the application of Fr itz salomon of Essexi-on-the Ruhr, Ger1nany,'fof an improvement in Process of Obtaining "Oxygenfl was QtrQ- v.

neously written and printed a Fried. Krupp that said ita n lsilon ltl h-riv bn mitten Rndjprinted the Firm Fried. Krupp; V and that said Lettr Patent ShOH Id be radw'ith v this cotreotionltherein that the same may conform to the record of the case in tlie Patent Office. I I

I Signed, cdullter signed, and sea-led this 23d day of December, A. 1890.

[SEAL] CYRUS BUssEY,- Gofintersjgn ed C. E; MITCHELL,

Commissioner of Patents.

As u'stant Secrtary of the Interior. 

